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Binding of PRC1 to H3K27me3 via its Polycomb subunit may help to recruit PRC1 to targets, but H3K27me3 is not absolutely required for PRC1 binding to target genes.In contrast to Pcl-PRC2, which localizes mainly to PREs, the core PRC2 might bind to chromosomes with much less specificity. To date,functional PREs have been identified and studied only in Drosophila, and the identification of PREs in plants will be a major contribution.